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(No Model.) 2 Sheets-Sheet 1.

H. G. FISKE.

MAGNETIC SEPARATDR.

No. 456,507. Patented July 21,1891.

FIG.|.

(No Model.)

2 Sheets-Sheet 2,

H. G. FISKE.

MAGNETIC SEPARATOR.

No. 456,507. Patented July 21, 1891.

FIG H a a 2 J2 I 5 3 /7 a, 7L '3' Q -UNITED STATES PATENT OFFICE.

HENRY G. FISKE, OF NEXV YORK, N. Y., ASSIGNOR TO JOHN D. CIIEEVER, OF SAME PLACE.

MAGNETIC SEPARATOR.

QPECIFIGATION forming part of Letters Patent No. 456,507, dated July 21, 1891.

Application filed March 26, 1891. Serial No. 386,528. (No model.)

Toall whom it may concern: the shield G is sufficient space for the pas- Be it known thatl, HENRY G. FIsKE, a resisage of a layer of ore. The non-magnetic dent of New York cit-y, county and State of particles will begin to fall from the magnetic New York, have invented a new and useful field atabout the end of the guard (Z, and 5 Improvement in Magnetic Separators, which they will collect in a pocket or receptacle improvement is fully set forth in the followformed by the inclined partitions E F. At mg specification. the lowest part of the pocket a trap e is ar- The present invention relates to the conranged, through which the railings maybe strnction of magnetic separators-and particudischarged. Beyond this receptacle in the IO larly to that type of apparatus in which the direction of movement of the magnet is the field-magnets consist of a number of cores pocket G, in which intermediates will be colcarried by a rotating shaft and projecting lected, the concentrates or products of highradially therefrom. In the use of apparatus est grade being carried around to the upper of this type the crushed ores (or other mate side of the field,fro1n which theyare removed i5 rials to be graded) are fed against a screen or in any suitable way.

shield surrounding the poles of the magnets, According to the plan illustrated in the and as the latter rotate they carry the mag drawings I cut out the coils of the field-magnetic particles to a suitable point where they net successively as they come to the top are picked oii or discharged, the non-mag of the field. The cores marked X are those 7:- 2o netic particles falling away from the magwhich are out out, the neutral part of the nets by gravity. field extending, as indicated, to the mouthof My invention includes certain new imthe ore-hopper. At the point where the neuprovements and combinations in magnetic t-ral point of the field begins I arrange a roseparatorsof this type, as will be particularly tating picker-magnet II, which collects the 25 pointed out in the following detailed descripmagnetic particles from tube 0 and discharges tion, reference being made to the drawings, them into the receptacle I. This latteris sepwhich accompany and form part of this speciarated from the adjacent compartment by a fication. water-tight partition 2'. The coils of magnet Figure I is a vertical section of the appa- H are cut out as they come over the mouth Sc go'ratus transverse to the magnetshaft. Fig. of receptacle l, as indicated by the cores ll is a vertical section lengthwise thereof; marked X.

Fig. III, a diagram illustrating the arrange- M represents an inlet for air or water, the ment of circuits, and Fig. IV a detail of the latter being preferred. Vhen water is used, brushes and commutator. it should rise in the vessel to about the level 8 5 5 A is a water-tight casing which incloses indicated by dotted line 3 and a gentle ourthe apparatus on all sides. Supported in rent should be kept flowing in the direction suitable bearings in this casing is a shaft B, of the arrows .e'-that is, in the opposite diby which are carried a series of radially-disrection to the movement of the magnets and posed cores b,all,secured at one end or pole shield, which rotate in the direction of the 0 to the ring or hub a. As indicated by the arrow Z. \Vhen air is used instead of water,

letters N S, the coils are so wound that a the current should be more energetic. north pole alternates with a south pole around Figs. II, III, and IV illustrate means which the entire circumference of the field. Outmay be added to rotate the shield and magside the poles and in close proximity thereto, .nets independently and to cut out the mag- 45 but out of contact therewith, is a tubular net-coils as they approach the upper part of shield C, so mounted that it can rotate indethe field. The magnet-shaft B is journaled pendently of the fieldanagnets. This shield in bearings in uprights O, and on one side has should be made of non-magnetic material. a hand-pulley Q. The otherendof theshaft Above and to one side of the magnetsis the is hollow, and through it pass the conductors I00 50 ore-hopper D, to which is attached a downleading to the magnet-coils. The drum or wardly-curved guard d, between which and shield O has hollow journals 1), which turn on shaft B, and one of which carries a band-pulley P. On the magnet-shaftB, near one end, is fixed an insulated copper conducting-ring l and commutator 5, whose sections are insulated in the usual way. The main conductor leads to brush 6, Whichis in contact with ring 4, from which the circuit proceeds by parallel branch wires 7 to the several magnet-coils b. The return-wires 8 lead from the several 10 coils and connect each with one section of the commutator 5.

Q is an annular brush-holder surrounding the commutator 5 and supported by a bar q bolted to the frame. It carries aseries of radially-arranged pencils or brushes 0*, Which are pressed by springs 75 against the commutator-sections 5. Thecircuitcontinuesthrough these brushes to the metal-holder Q, with which the return-conductor 2 is permanently connected. It will be seen from Fig. IV that several of the commutator-sections (four, as shown) have no brushes to connect them with thereturn-conductor. Consequentlythe coils connected with these sections are, for the time being, disconnected from the circuit.

Any other suitable cut-out mechanism may be substituted for that shown in the drawings.

In operation, the field-magnets and the shield 0 being rotated in the, same direction, but at different speeds, and the ore being fed against the shield, the magnetic particles seek at once to attach themselves to the surface of the shield. As they are caused to move from one pole to another of opposite polarity, they tumble over and thus tend to clear them selves from the non-magnetic matters. This action continues until when the end of guard d is reached the tailings are free to disengage 4o themselves and fall by gravity. At this point the gangue encounters the current of water or air, in which the agitation of the mass, due to the continued reversals of polarityto which each particle is exposed, assists in cleansing and separating the magnetic particles from the mixed mass. The different velocities of the magnets and shield can be determined to make these reversals occur with greater or less frequency, as may be found most desir- 5o able. When the particles adhering to the shield reach the neutral point of the field, the magnetic portions thereof are attractedto the surface of the picker-magnet H. A further separation takes place at this point, inasmuch as the particles which are largely or wholly non-magnetic have an opportunity to fall back into the receptacle G provided for the intermediate grade or lean ores.

I claim as my invention 1. The process of separating magnetic particles from associated impurities by feeding the mass th rough the field of a moving series of magnets at a speed different from that of the magnets and subjecting the mass While traversing said field to continued reversals of polarity, the movement of the mass being in opposition to a current of fluid, substantially as described.

2. The combination of a series of magnets of alternately-opposite polarity arranged radially on a rotatory shaft, a tubular shield rotatable freely around said magnets and independently thereof, a hopper for delivering ore or other material against said shield, and a case or chamber inclosing said magnets and shield and provided with an inlet for admitting air or water on the side opposite to said hopper, so that the current moves in the opposite direction to the feed of the materials under treatment, substantially as described.

3. The combination of a water-tight casing provided with an inlet, a series of magnets of alternately opposite polarity arranged radially on arotatory shaft within said case, a shield rotatable around said magnets, and a hopper having a discharge-opening, in proximity to said shield, substantially as described.

4. The combination of a se ies of magnets mounted on a rotatable shaft and forming a cylindrical field presenting alternately opposite poles, a shield rotatable around said magnets, a hopper having a discharge-opening at the upper part of the field, and a rotatable picker-magnet close to the upper part of the field on the side opposite to said hopper, the coils of the several fieldmagnets between the picker-magnet and discharge-opening being cut out of circuit, so that the field between the two points is neutral, substantially as described.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

HENRY c. FISKE,

Witnesses:

PHILIP MAURO, J oNAB. CILLEY. 

